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Stockholders' Equity - Stock Repurchase Program (Details) - $ / shares
3 Months Ended 12 Months Ended 62 Months Ended
Oct. 23, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Eleventh Plan          
Class of Stock [Line Items]          
Outstanding share, percent 5.00%        
Outstanding common shares in the plan 1,513,000        
Eleventh Plan          
Class of Stock [Line Items]          
Repurchased shares   292,712 0 0 872,678
Average price of shares repurchased (in usd per share)   $ 26.50     $ 20.03